Staybolt structure for steam-boilers



Y resident of UNITI-:D STATES PATENT OFFICE.

JOHN ROGERS rnnnnnnr, lor frirfrsnunen, rnNNsYLveN-IA, AssIeNon To FLANNEBYIBOLT OOMPANY, or PITTSBURGH,PENNSYLVANIA.'

.Application filed vApril 1'?,

To all` w kom tmez/ concern."

Be it known thatI JOHN Roenes ELAN- -Nnnna citizen of ytheUnited States, and a Pittsburgh, inthe county OAL legheny and State of Pennsylvania, have invented certain new .and useful Improvements in Staybolt Structures Vfor Steam- Boilers; and I do hereby declare ythe .fob lowing to be a full, clear, yand exact description of the invention, such as Iwill enable others skilled in the, art to `whichxit appertains to make and usethewsarne.

rlhis invention relates to improvements 1n staybolt structures for boilers,one object Ot the invention being to provide simple means whereby both ends ot a double headed staybolt shall be employed to connect the Outer and inner boiler sheets and movably connected with both, and so that the bolt heads and their bearings will be so protected as to obviate leakage.

IVith this and other objects in view, the invention consists in certain novel features of construction and combinationsy of parts as hereinafter set forth and pointed out in the claims.

In the accompanying drawings; Figure 1 is a sectional view showing an embodiment of my invention; Figs. 2, 8 and l are detail views, and Fig. 5 is a view showing a modication.

1 represents the outer sheet and 2 the inner sheet of a boiler. The outer boiler sheet is provided with openings such as illustrated at 3 and a portion of each of said openings is enlarged and made vwith a curved wall to form a bearing for the head Il which is made integral with the outer end ot the body portion 5 ot a staybolt. A. cap or closure 52L is disposed over the head/i ot the staybolt so as to cover the same, said cap having such internal dimensions as to provide a clearance space 6. The cap 5a may be inade concavo-convex in form and its edge portion may be beveled as at 7 and engage the outer tace of the outer boiler sheet around the bolt head and its bearing in the boiler sheet. Between the beveled edge of the cap and the outer boiler sheet, a welding alloy is accumulated or built up by a suitable electric or other welding method, as indicated at 8, and thus the cap is securely welded tO the outer face of the outer boiler sheet.

The staybolt is provided also at its inner end with a head 9 and this head (which is Specification of Letters Patent. Patented NOV'. 23, n191,2(L

1era serial ivo. 290,708.

preferablysmaller than the headlat the fQuter end of vthe bolt) is made sphericallin form. @he spherical/head or bailllbat the innerfend of the bolt ,is movablyiinonnted, the partly spherical lsocket 4Ot thimble 10 having ,a threadedshank 11 lizassinglthrough athreadved opening in the inner bollensheet. vThuis a win be Seesen@ the @inmanente vstar bolt has a universal or ball-ancl-socket connection with ,the inner boilensheet, and when said thimble shall, havello/eenY p'laeedinposi non, a .win te .weelderige treinta# .rat .for the inner boiler sheet with the use Aofa weld ing alloy which is welded by electric or other welding method to the threaded shank and the inner boiler sheet as indicated at 12.

The thimble with its shank is made in a plurality of parts, two parts being indicated in Figs. 1, 2 and and the shank portion is made o-sufcient length to compensate for varying distances apart or" the sheets orming the water leg of the boiler.

In assembling the thimble on the-inner headed end of the staybolt, the members Ot the thimble are placed on the head or ballV '9 and the abutting edges of said members may be Welded together. The shank portion of the thimble will then be threaded and ai!- ter the staybolt and thimble shall have been placed in position in the boiler sheets, a surplus portion of the threaded shank will be cut otf,'leaving only a short portion projecting inwardly beyond the inner boiler sheet, and the weld 12 will be built up around this projecting portion of the shank.

Instead of forming the outer head 4 of the staybolt integral with the body of the bolt, the latter may be threaded, as at 13,

v and a partly spherical head 14, made in the form of a sleeve; screwed on said outer end portion Oi. the body of the bolt, as shown Y in Fig. 5.

Other changes might be made in the details of construction of my invention without' departing from the spirit thereof or limiting its scope and hence I do not wish to restrict myselito the precise details here` in set forth.

Having fully described my invention what I claim as new and desire to secure by LettersPatent, is zl. 'Ihe combination with Outer and inner boiler sheets of a staybolt having a head at each end, the outer sheet carrying a bearing :for the Outer head of the bolt, a thimble comprising a plurality of parts Welded together and forming a socket to receive the head at the inner'end of the bolt and a threaded shank to pass through the inner boiler sheet, and avweld surrounding the shank portion of the thimble and Welding the same to the inner boiler sheet,

` 2. The combination with an outer boiler p sheet provided With a bearingfor the head of a bolt, and an inner boiler sheet having an opening, of a bolt havingr heads integral with its respective ends, the outer head mounted in the bearing on theouter boiler sheet,'athi1nble comprising a plurality of united parts having a shank passing` through the inner boiler sheet and Welded to the latter, said thinble having a socket portion receiving the head at the inner end Vor' the staybolt.

3; The combination with outer and inner boiler sheets, of a staybolt having a head at each end, one of said boiler sheets provided with a bearing for-the head at one end of bolt and a shank secured to the other boiler sheet. f

In testimony whereof, I have signed this speoilioation in the presence of two subseribing Witnesses.

JOHN ROGERS FLANNERY. Witnesses:

ETHAN I. DoDns, JAS. R. HORAN. 

